Hereunder is a case of the customized PP woven bag recycling machine (pelletizing line) for overseas customers. Designed with a capacity of 300–400 kg/h, this system processes PP woven bags and PP spun yarn, and is also fully compatible with clean recycled PE bags and PE film scrap.
PP woven bags and spun yarn are bulky, fibrous materials prone to bridging and uneven feeding, which causes extruder surging and poor plastication. Mconvey’s PP woven bag recycling machine removes conventional stuffer hoppers. Centered on an optimized single‑screw extruder, it integrates intelligent shredding, dynamic forced side‑feeding, high‑flow filtration, PP‑optimized water‑ring pelletizing, and automatic bagging to resolve the core instability issues of fibrous feedstock.
Mconvey’s PP woven bag recycling machine Process Workflow:
- Feeding & Pre-Treatment: Manual Feed → Belt Conveyor with Metal Detector → Water-Cooled Single-Shaft Shredder
- Extrusion & Feeding: Single-Screw Forced Side-Feeder → Single-Screw Extruder (with volumetric Doser)
- Melt Filtration: Dual-Station Hydraulic Screen Changer
- Pelletizing & Cooling: Horizontal Water-Ring Pelletizer → Water Cooling Tank
- Dewatering & Packaging: Vertical Dewatering Unit → Vibrating Screen → Vacuum Conveying → Automatic Valve Bag Packer
Key Technical Features
Water-Cooled Single-Shaft Shredder with Dynamic Control
The system uses no stuffer hopper—the shredder feeds directly into the extrusion line. As a heavy-duty PP woven bag recycling machine, it easily handles tough, high-tenacity materials such as PP woven bags, FIBC jumbo bags, and PP spun yarn.The water-cooled shaft dissipates friction heat to prevent material melting and overheating.
- Direct-Feed Efficiency: Bypasses conventional stuffer hoppers to streamline the recycling process.
- Water-Cooled Shaft: Effectively dissipates friction heat to prevent material melting and overheating.
- Smart Load Management: A dynamic algorithm adjusts speed and torque in real time to eliminate shaft wrapping and jamming.
- Uniform Feed Quality: uniform particle size to protect the extruder down the line.
Dynamic Forced Side-Feeding for Stable Supply
Shredded material is force-fed into the extruder via a specialized screw side-feeder. A dynamic algorithm adjusts the feed rate in real time to eliminate bridging and starvation. By forming a seamlessly closed-loop process, the integrated shredding, feeding, and extrusion system delivers a steady material supply and maintains stable extruder pressure for the PP woven bag recycling machine.
Optimized Single-Screw Extruder for Fibrous Recyclate
The extruder features a large L/D ratio screw, a spiral feed bushing, and a grooved barrel designed for stable melt, thorough plastication, and uniform output. The barrel is equipped with a reserved port for a volumetric doser, enabling flexible color adjustment and masterbatch dosing during continuous production.
High-Capacity Dual-Station Screen Changer
Equipped with a 160 mm hydraulic dual-piston screen changer offering a total filtration area of 1,600 cm², this PP woven bag recycling machine effectively removes fine fiber contaminants and impurities. It supports continuous screen changes without stopping the extruder, maximizing overall production uptime.
PP-Specific Horizontal Water-Ring Pelletizer
Given PP’s high melt flow index, most conventional lines rely on strand cutting; proven water-ring pelletizing solutions for PP are rare. This unit features a balanced blade pressure mechanism for extended blade life, integrated with VFD + PID automatic speed control to produce uniform, non-sticking pellets tailored specifically for high-MFI PP melts.
Valve Bag Packing + PLC Centralized Control
Once cooled, dewatered, and screened, the finished pellets are automatically processed and monitored through an integrated downstream system:
- Automated Bagging: Pellets are transferred via vacuum conveying directly to the valve bag packer for precise, automated packaging.
- Centralized PLC Integration: A centralized PLC system manages the entire PP woven bag recycling machine, ensuring seamless communication with both conveying and packing units.
- Real-Time HMI Monitoring: Key operating metrics—such as extrusion temperatures, system pressures, and throughput—are displayed on the HMI for intuitive monitoring and process optimization.
Mconvey offers customized pelletizing and solutions for multiple plastic materials, including PP, PE, PVC, and various industrial recyclates. All solutions are tailored to meet your specific raw material characteristics, factory site layout, and capacity requirements.
For recycling project inquiries, please contact: +86 13392775773 (WhatsApp)
